[Python-checkins] [python/cpython] cb2877: improve alignment autoconf test

[GitHub]

  Branch: refs/heads/benjamin-aligned-autoconf
  Home:   https://github.com/python/cpython
  Commit: cb2877ef99d92306535c0d52728c2d44053c2c43
      https://github.com/python/cpython/commit/cb2877ef99d92306535c0d52728c2d44053c2c43
  Author: Benjamin Peterson <benjamin at python.org>
  Date:   2017-04-13 (Thu, 13 Apr 2017)

  Changed paths:
    M aclocal.m4
    M configure
    M configure.ac

  Log Message:
  -----------
  improve alignment autoconf test

Replace the deprecated AC_TRY_RUN with AC_RUN_IFELSE. Also, standardize the
variable name and allow for caching of the result.